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Home My WebLink About12567-R-GEOT-Hart Crowser-2016-11-29 3131 Elliott Avenue, Suite 600 Seattle, Washington 98121 Tel 206.324.9530 MEMORANDUM DATE: November 29, 2016 TO: Rob Reifsnyder, PACCAR FROM: Rolf B. Hyllseth, PE and Garry E. Horvitz, PE RE: Geotechnical Report Update – SW Fill Area PACCAR Renton Parts Distribution Center (PDC) Renton, Washington 17946‐02 CC: Jason Hubbell, Barghausen Engineers Vicki Zumbrunnen, PACCAR As requested by the City of Renton, this memorandum provides updated geotechnical engineering recommendations for the SW Fill Area of the PDC project site, located adjacent to Garden Avenue North and North 4th Street as shown on the Barghausen Phase 3 Temporary Erosion Control and Grading Plans for the project (dated November 15, 2016). The fill placed in this portion of the site consists of relocated preload fill material from the original PDC building pad. Hart Crowser monitored the preload fill placement and removal process during construction. The updated recommendations in this memorandum should only be used in conjunction with the general recommendations of our geotechnical engineering design study dated September 25, 2014, and subsequent supplemental recommendations provided by Hart Crowser. This memorandum is for the exclusive use of PACCAR, Barghausen Engineers, and their consultants for specific application to the subject project and site. We completed this memorandum in accordance with geotechnical practices generally accepted for work of a similar nature done in the same timeframe, in the same or similar localities, and under similar conditions. No other warranty, express or implied, is made. SW Fill Placement Recommendations The fill placed in the SW portion of the site is considered non‐structural (i.e. not intended to support buildings, paved roads, or other surface structures). As such, geotechnical field observation or compaction testing was not required during placement. It is our opinion that track‐walking the fill PACCAR 17946‐02 November 29, 2016 Page 2 material with construction equipment during placement has provided adequate compaction for the intended purpose. We are not aware of any current plans to redevelop this portion of the site. If site development is considered for this portion of the site in the future, the building pad will be reevaluated for potential building support by the geotechnical engineer at that time. We understand that the current 2H:1V (Horizontal:Vertical) fill slopes along Garden Avenue will be flattened to 4H:1V as part of the current regrading effort. This will improve long‐term stability of this portion of the fill. We recommend that the exposed soil along the new slopes be revegetated as soon as possible following regrading, to minimize the risk of erosion and sedimentation runoff. The proposed regrading along the west edge of the SW fill area (Garden Avenue side) may expose previously placed and covered contaminated soil. Such potentially exposed contaminated soil should be managed (relocated if necessary) and capped by a minimum 1‐foot thick clean soil cap layer, according to the existing contaminated soil handling protocols for the site. On-site Infiltration Potential Because of the fine‐grained nature of the near‐surface soils and presence of contaminated soils (below protective clean soil cap), the site is not considered suitable for on‐site stormwater infiltration. Fill Source Statements The material placed in the SW fill area consists of previously imported preload fill used for the PDC building construction. The original City of Renton Fill Source Statements submitted for this imported preload fill are attached to this memorandum for reference. Attachment: Fill Source Statements L:\Notebooks\1794602_PACCAR PDC Construction\Deliverables\Memos\Geotech Report Update Memo\Geotechnical Report Update Memorandum.docx H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 FILL SOURCE STATEMENT FOR PROJECTS IN THE AQUIFER PROTECTION AREA (APA) CITY OF RENTON Development Services Division 1055 South Grady Way, Renton WA 98055 Phone: (425) 430-7200 A Fill Source Statement CERTIFIED BY A PROFESSIONAL ENGINEER OR GEOLOGIST licensed in the State of Washington is required in the following circumstances: 1. More than 50 cubic yards of fill will be imported to a project site located in Zone 1 of the Aquifer Protection Area. 2. More than 100 cubic yards of fill will be imported to a project site located in Zone 2 of the Aquifer Protection Area. Exception: A Fill Source Statement is not required if documentation is provided that the fill to be imported comes from a Washington Department of Transportation approved source. It is required that fill material be sampled AT THE FILL SOURCE SITE and analyzed by a laboratory to rule out contamination. See 11 below. A fill source site may qualify for an ABBREVIATED FILL SOURCE STATEMENT if the source site has never been filled, developed, or subjected to use that could have introduced chemical contamination to the site. The abbreviated format does not require sampling and analysis of fill to detect contamination and, therefore, reduces applicant costs. Please use attached form entitled “Abbreviated Fill Source Statement”. A SEPARATE SOURCE STATEMENT IS REQUIRED FOR EACH FILL SOURCE SITE. A copy of the Renton Municipal Code section requiring the Fill Source Statement is attached for your information. (RMC 4-4-060L4). CONTACT THE DEVELOPMENT SERVICES DIVISION TO DETERMINE IF YOUR PROJECT SITE IS LOCATED IN THE APA. NOTE: The Department has the authority to request additional information regarding imported fill material and to reject a source statement if it does not demonstrate that the fill material meets City standards and/or the Department has reason to suspect that the fill material could be contaminated. Such requests or rejections shall be made in writing to the applicant. 1. Project Site Address: 2. Project Site King County Tax Assessor Account Number: 3. In which Aquifer Protection Area Zone is the project site located, 1 or 2? 4. Cubic yards of fill to be imported to project site: 5. Project applicant name: 6. Fill source site address: 7. Fill source site King County Tax Assessor Account Number: Table 1: Results of Source Fill Characterization Sampling and Analysis5th and ColumbiaSample #Kerosene/Jet FuelDiesel/Fuel Oil Heavy OilVolatile Organic Compounds (ug/kg) cPAHs (ug/kg) Arsenic Chromium LeadP20‐24 20 U20 U50 U‐‐ ‐‐1 U 2.3 3.4P35‐40 20 U20 U50 U‐‐ ‐‐1 U 2.4 2.7P31‐44 20 U20 U50 UND ND1 U 2U 2.6P65‐50 20 U20 U50 UND ND1 U 2U 3.4P50‐58 20 U20 U50 U‐‐ ‐‐1 U 2U 2.1P89‐83 20 U20 U50 U ND* ND 1 U 2U 3.3P78‐87 20 U20 U50 U‐‐ ‐‐1 U 2U 2.7P69‐92 20 U20 U50 U‐‐ ‐‐1 U 2U 2.4P13‐90 20 U20 U50 U‐‐ ‐‐1 U 2U 2.8Note: Soil samples collected from 5th and Columbia Construction Site on January 2, 2015 U ‐ not detected at concentration limit specified ND ‐ not detected* ‐ 1,2,4‐Trimethylbenzene detected at concentration of 82 ug/kgNWTPH‐Dx (mg/kg) Metals (mg/kg) H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 Renton Municipal Code 4-4-060 Grading, Excavation, and Mining Regulations L. FILLS: 1. Applicability and Exemptions: Unless otherwise recommended in the approved soil engineering report, fills shall conform to the provisions of this Section. In the absence of an approved soil engineering report, these provisions may be waived for minor fills not intended to support structures. For minor fills or waste areas, humps, hollows or water pockets shall be graded smooth with acceptable slopes. 2. Fill Location: Fill slopes shall not be constructed: a. On natural slopes steeper than two-and-one-half horizontal to one vertical (2.5:1) that are fifteen feet (15') or greater in height (except in conjunction with a modification granted per RMC 4-9-250D1 for filling against the toe of a natural rock wall - see RMC 43-060N2a(ii)(2)); or b. Where the fill slopes toes out within twelve feet (12') horizontally of the top of existing or planned cut slopes that are fifteen feet (15') or greater in height and steeper than two-and-one-half horizontal to one vertical (2.5:1). (Amd. Ord. 4835, 3-27-2000; Ord. 4851, 8-7-2000) 3. Preparation of Ground: The ground surface shall be prepared to receive fill by removing vegetation, noncomplying fill, topsoil and other unsuitable materials as determined by the soil engineer, and where the slopes are five to one (5:1) or steeper, by benching into sound bedrock or other competent material. 4. Fill Material: Fill materials shall have no more than minor amounts of organic substances and shall have no rock or similar irreducible material with a maximum dimension greater than eight inches (8"). Fill material shall meet the following requirements: a. Construction, Demolition, and Land Clearing Waste Prohibited: Fill material shall be free of construction, demolition, and land clearing waste except that this requirement does not preclude the use of recycled concrete rubble per Washington State Department of Transportation Standard Specifications for Road, Bridge, and Municipal Construction. b. Cleanliness of Fill Material: Fill material shall not contain concentrations of contaminants that exceed cleanup standards for soil specified in WAC 173-340- 740, Model Toxics Control Act, regardless of whether all or part of the contamination is due to natural background levels at the fill source site. For project sites located in Zone 1 of the Aquifer Protection Area, fill material shall not contain detectable concentrations of petroleum per the definition of Class 1 Soils contained in Table V in "Guidance for Remediation of Petroleum Contaminated Soils" published by the Department of Ecology. Where the detection limit (lower limit at which a chemical can be detected by a specified laboratory procedure) for a particular soil contaminant exceeds the cleanup standard for soil specified in WAC 173-340-740, then the detection limit shall be the standard for fill material quality. Detection limits shall be a published by the Department of Ecology in the current version of "TABLE II: SOIL, Method Detection Limits, Practical Quantitation Limits, and Comparison of Method B Values" or other source of information accepted by the Department if the Ecology publication does not address the contaminant. H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 c. Special Requirement for Projects Located in Zone 1 of the Aquifer Protection Area and Which Will Involve Placement of More than Fifty (50) Cubic Yards of Imported Fill: A source statement certified by a professional engineer licensed in the State of Washington shall be provided to the Department and shall be reviewed and accepted by the Department prior to stockpiling or grading imported fill at the project site. The source statement, as defined in RMC 4-8- 120D19, shall be required for each source location from which imported fill will be obtained. (Amd. Ord. 4851, 8-7-2000) d. Special Requirement for Projects Located in Zone 2 of the Aquifer Protection Area and Which Will Involve Placement of more than One Hundred (100) Cubic Yards of Imported Fill: The source statement described in RMC 4-8-120D19 is required for each source location from which imported fill will be obtained. (Amd. Ord. 4851, 8-7-2000) e. Abbreviated Source Statement for Aquifer Protection Area: The Department may accept a source statement, as defined in RMC 4-8-120D19, that does not include results of sampling and analysis of imported fill if it determines that adequate information is provided indicating that the source location is free of contamination. In addition to the information otherwise required by subsection as defined in RMC 4-8-120D19, such information may include, but is not limited to: i. Results of field testing of earth materials to be imported to the site with instruments capable of detecting the presence of contaminants; and ii. Results of previous sampling and analysis of earth materials to be imported to the site. (Amd. Ord. 4851, 8-7-2000) f. Source Statement Not Required for Imported Fill Obtained from Washington State Department of Transportation Approved Source: The source statement defined in RMC 4-8-120D19 is not required for those projects located in the aquifer protection area if contractual documents confirm that imported fill will be obtained from a Washington State Department of Transportation approved source. (Amd. Ord. 4851, 8-7-2000) g. Sampling and Analysis Procedures: The professional engineer or person under the professional engineer's supervision who samples earth materials to be used as imported fill, oversees analysis, and prepares the source statement required by subsections L4c and L4d of this Section shall follow procedures specified in WAC 173-340-820 and 173-340-830 of the Model Toxics Control Act Cleanup Regulation and "Guidance on Sampling and Data Analysis Methods" published by the Department of Ecology for earth materials potentially contaminated with hazardous materials other than petroleum. Procedures specified in "Guidance for Remediation of Petroleum Contaminated Soils" published by the Department of Ecology shall be followed for earth materials potentially contaminated with petroleum. h. Permittee Subject to Required Actions after Illegal Placement of Imported Fill. A permittee who stockpiles or grades imported fill at the site without Department review and acceptance of the source statement required by subsections L4c and L4d of this Section or who stockpiles or grades fill at the site that does not meet the fill quality requirements of subsections L4a and L4b of this Section is subject to measures specified by the Department to reduce risk of contamination of the site due to illegal placement of fill. Such measures may include, but are not limited to, any or all of the following and shall be implemented at the permittee's expense: H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 1. Provide the Department with a source statement meeting the requirements of subsection L4c of this Section within a time-period specified by the Department; 2. Immediately cover fill with a waterproof cover; 3. Immediately remove fill; 4. Installation of monitoring wells and monitoring of ground water quality; 5. Remediation of contamination of the site caused by the illegal placement of fill according to a schedule specified by the Department and in accordance with cleanup standards for soil and groundwater described in the Model Toxics Control Act Cleanup Regulation, Chapter 173-340. i. Department Authority to Conduct Independent Sampling and Analysis: The Department shall have the authority to enter on to private property to conduct independent sampling and analysis of fill. If the Department determines that fill does not meet fill quality standards of subsections L4a and L4b of this Section, then it may require the permittee to accomplish any or all of the measures listed in part h. of this subsection at his or her own expense. j. Department Authority to Implement Removal and Remediation Measures: The Department or its authorized agents shall have the authority to implement measures listed in subsection L4h of this Section if the permittee fails to accomplish such measures in a timely manner. The permittee shall be responsible for any costs incurred by the Department or its authorized agents in the conduct of such activities. (Amd. Ord. 4740, 7-19-1999) 5. Minimum Compaction: All fills shall be compacted to a minimum of ninety five percent (95%) of maximum density as determined by American Public Works Association (APWA) specifications. Field density shall be determined in accordance with APWA standards. 6. Maximum Slope: The slope of fill surfaces shall be no steeper than is safe for the intended use. Except in conjunction with a modification granted per RMC 4-9-250D1 for one of the circumstances listed in RMC 4-3-050N2a(ii) (Geologic Hazards - Modifications), fill operations associated with a plat, short plat, subdivision or dedication, or other permitted land development activity which would result in the creation of permanent slopes forty percent (40%) or greater which are fifteen feet (15') in height, i.e., protected slopes, shall not be approved. (Amd. Ord. 4835,3-27- 2000) 7. Drainage and Terracing: Drainage and terracing shall be provided and the area above fill slopes and the surfaces of terraces shall be as required by subsection N of this Section. H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 Renton Municipal Code 4-8-120D Definitions of terms used in submittal requirements for Building, Planning, and Public Works permit applications 19. Definitions A Source Statement, Fill Material, Aquifer Protection Area: A source statement providing the following information: a. The source location of imported fill; b. Previous land uses of the source location; c. Whether or not earth materials to be removed from the source location are native, undisturbed soil; d. Whether or not the source location appears on government lists of contaminated sites including those developed pursuant to the State Model Toxics Control Act and the Federal Comprehensive Environmental Response, Compensation, and Liability Act; e. Results of sampling and analysis pursuant to RMC 4-4-060L4g, Fill Material, Sample and Analysis Procedures; and f. Whether or not imported fill meets fill quality standards described in RMC 4-4- 060L4a, Fill Material, Construction, Demolition and Land Clearing Waste Prohibited, and RMC 4-4-060L4b, Fill Material, Cleanliness of Fill Material. (Ord. 4851, 8-7- 2000) H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 FILL SOURCE STATEMENT FOR PROJECTS IN THE AQUIFER PROTECTION AREA (APA) CITY OF RENTON Development Services Division 1055 South Grady Way, Renton WA 98055 Phone: (425) 430-7200 A Fill Source Statement CERTIFIED BY A PROFESSIONAL ENGINEER OR GEOLOGIST licensed in the State of Washington is required in the following circumstances: 1. More than 50 cubic yards of fill will be imported to a project site located in Zone 1 of the Aquifer Protection Area. 2. More than 100 cubic yards of fill will be imported to a project site located in Zone 2 of the Aquifer Protection Area. Exception: A Fill Source Statement is not required if documentation is provided that the fill to be imported comes from a Washington Department of Transportation approved source. It is required that fill material be sampled AT THE FILL SOURCE SITE and analyzed by a laboratory to rule out contamination. See 11 below. A fill source site may qualify for an ABBREVIATED FILL SOURCE STATEMENT if the source site has never been filled, developed, or subjected to use that could have introduced chemical contamination to the site. The abbreviated format does not require sampling and analysis of fill to detect contamination and, therefore, reduces applicant costs. Please use attached form entitled “Abbreviated Fill Source Statement”. A SEPARATE SOURCE STATEMENT IS REQUIRED FOR EACH FILL SOURCE SITE. A copy of the Renton Municipal Code section requiring the Fill Source Statement is attached for your information. (RMC 4-4-060L4). CONTACT THE DEVELOPMENT SERVICES DIVISION TO DETERMINE IF YOUR PROJECT SITE IS LOCATED IN THE APA. NOTE: The Department has the authority to request additional information regarding imported fill material and to reject a source statement if it does not demonstrate that the fill material meets City standards and/or the Department has reason to suspect that the fill material could be contaminated. Such requests or rejections shall be made in writing to the applicant. 1. Project Site Address: 2. Project Site King County Tax Assessor Account Number: 3. In which Aquifer Protection Area Zone is the project site located, 1 or 2? 4. Cubic yards of fill to be imported to project site: 5. Project applicant name: 6. Fill source site address: 7. Fill source site King County Tax Assessor Account Number: Table 1: Results of Source Fill Characterization Sampling and Analysis1007 Stewart Construction SiteNWTPH‐G (mg/kg)Sample # GasolineDiesel Heavy OilVolatile Organic Compounds (ug/kg) cPAHs (ug/kg) Arsenic Chromium LeadTP‐1‐10‐‐ ‐‐ ‐‐ ‐‐ ‐‐1 U 2.5 2.4TP‐2‐10‐‐ ‐‐ ‐‐ ‐‐ND 1 U2 U 2TP‐3‐10‐‐ ‐‐ ‐‐ ‐‐ ‐‐1 U 2 2.7TP‐4‐10‐‐ ‐‐ ‐‐ ‐‐ND 1 U 2.2 2.8TP‐5‐10‐‐ ‐‐ ‐‐ ‐‐ ‐‐1 U2 U 1.7S‐N3 7 U27 U67 UND‐‐ ‐‐ ‐‐ ‐‐S‐N13 5 U21 U53 UND‐‐ ‐‐ ‐‐ ‐‐S‐N10 6 U23 U57 UND‐‐4.99 48 10.2S‐N4 5 U19 U 51.1 UND‐‐ ‐‐ ‐‐ ‐‐SP‐1a‐NE 5 U26 U64 UND‐‐ ‐‐ ‐‐ ‐‐SP‐1b‐NE 5 U27 U66 UND‐‐ ‐‐ ‐‐ ‐‐Note: Soil samples collected from 1007 Stewart Construction Site on January 8, 2015 U ‐ not detected at concentration limit specified ND ‐ not detectedNWTPH‐Dx (mg/kg) Metals (mg/kg) H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 Renton Municipal Code 4-4-060 Grading, Excavation, and Mining Regulations L. FILLS: 1. Applicability and Exemptions: Unless otherwise recommended in the approved soil engineering report, fills shall conform to the provisions of this Section. In the absence of an approved soil engineering report, these provisions may be waived for minor fills not intended to support structures. For minor fills or waste areas, humps, hollows or water pockets shall be graded smooth with acceptable slopes. 2. Fill Location: Fill slopes shall not be constructed: a. On natural slopes steeper than two-and-one-half horizontal to one vertical (2.5:1) that are fifteen feet (15') or greater in height (except in conjunction with a modification granted per RMC 4-9-250D1 for filling against the toe of a natural rock wall - see RMC 43-060N2a(ii)(2)); or b. Where the fill slopes toes out within twelve feet (12') horizontally of the top of existing or planned cut slopes that are fifteen feet (15') or greater in height and steeper than two-and-one-half horizontal to one vertical (2.5:1). (Amd. Ord. 4835, 3-27-2000; Ord. 4851, 8-7-2000) 3. Preparation of Ground: The ground surface shall be prepared to receive fill by removing vegetation, noncomplying fill, topsoil and other unsuitable materials as determined by the soil engineer, and where the slopes are five to one (5:1) or steeper, by benching into sound bedrock or other competent material. 4. Fill Material: Fill materials shall have no more than minor amounts of organic substances and shall have no rock or similar irreducible material with a maximum dimension greater than eight inches (8"). Fill material shall meet the following requirements: a. Construction, Demolition, and Land Clearing Waste Prohibited: Fill material shall be free of construction, demolition, and land clearing waste except that this requirement does not preclude the use of recycled concrete rubble per Washington State Department of Transportation Standard Specifications for Road, Bridge, and Municipal Construction. b. Cleanliness of Fill Material: Fill material shall not contain concentrations of contaminants that exceed cleanup standards for soil specified in WAC 173-340- 740, Model Toxics Control Act, regardless of whether all or part of the contamination is due to natural background levels at the fill source site. For project sites located in Zone 1 of the Aquifer Protection Area, fill material shall not contain detectable concentrations of petroleum per the definition of Class 1 Soils contained in Table V in "Guidance for Remediation of Petroleum Contaminated Soils" published by the Department of Ecology. Where the detection limit (lower limit at which a chemical can be detected by a specified laboratory procedure) for a particular soil contaminant exceeds the cleanup standard for soil specified in WAC 173-340-740, then the detection limit shall be the standard for fill material quality. Detection limits shall be a published by the Department of Ecology in the current version of "TABLE II: SOIL, Method Detection Limits, Practical Quantitation Limits, and Comparison of Method B Values" or other source of information accepted by the Department if the Ecology publication does not address the contaminant. H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 c. Special Requirement for Projects Located in Zone 1 of the Aquifer Protection Area and Which Will Involve Placement of More than Fifty (50) Cubic Yards of Imported Fill: A source statement certified by a professional engineer licensed in the State of Washington shall be provided to the Department and shall be reviewed and accepted by the Department prior to stockpiling or grading imported fill at the project site. The source statement, as defined in RMC 4-8- 120D19, shall be required for each source location from which imported fill will be obtained. (Amd. Ord. 4851, 8-7-2000) d. Special Requirement for Projects Located in Zone 2 of the Aquifer Protection Area and Which Will Involve Placement of more than One Hundred (100) Cubic Yards of Imported Fill: The source statement described in RMC 4-8-120D19 is required for each source location from which imported fill will be obtained. (Amd. Ord. 4851, 8-7-2000) e. Abbreviated Source Statement for Aquifer Protection Area: The Department may accept a source statement, as defined in RMC 4-8-120D19, that does not include results of sampling and analysis of imported fill if it determines that adequate information is provided indicating that the source location is free of contamination. In addition to the information otherwise required by subsection as defined in RMC 4-8-120D19, such information may include, but is not limited to: i. Results of field testing of earth materials to be imported to the site with instruments capable of detecting the presence of contaminants; and ii. Results of previous sampling and analysis of earth materials to be imported to the site. (Amd. Ord. 4851, 8-7-2000) f. Source Statement Not Required for Imported Fill Obtained from Washington State Department of Transportation Approved Source: The source statement defined in RMC 4-8-120D19 is not required for those projects located in the aquifer protection area if contractual documents confirm that imported fill will be obtained from a Washington State Department of Transportation approved source. (Amd. Ord. 4851, 8-7-2000) g. Sampling and Analysis Procedures: The professional engineer or person under the professional engineer's supervision who samples earth materials to be used as imported fill, oversees analysis, and prepares the source statement required by subsections L4c and L4d of this Section shall follow procedures specified in WAC 173-340-820 and 173-340-830 of the Model Toxics Control Act Cleanup Regulation and "Guidance on Sampling and Data Analysis Methods" published by the Department of Ecology for earth materials potentially contaminated with hazardous materials other than petroleum. Procedures specified in "Guidance for Remediation of Petroleum Contaminated Soils" published by the Department of Ecology shall be followed for earth materials potentially contaminated with petroleum. h. Permittee Subject to Required Actions after Illegal Placement of Imported Fill. A permittee who stockpiles or grades imported fill at the site without Department review and acceptance of the source statement required by subsections L4c and L4d of this Section or who stockpiles or grades fill at the site that does not meet the fill quality requirements of subsections L4a and L4b of this Section is subject to measures specified by the Department to reduce risk of contamination of the site due to illegal placement of fill. Such measures may include, but are not limited to, any or all of the following and shall be implemented at the permittee's expense: H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 1. Provide the Department with a source statement meeting the requirements of subsection L4c of this Section within a time-period specified by the Department; 2. Immediately cover fill with a waterproof cover; 3. Immediately remove fill; 4. Installation of monitoring wells and monitoring of ground water quality; 5. Remediation of contamination of the site caused by the illegal placement of fill according to a schedule specified by the Department and in accordance with cleanup standards for soil and groundwater described in the Model Toxics Control Act Cleanup Regulation, Chapter 173-340. i. Department Authority to Conduct Independent Sampling and Analysis: The Department shall have the authority to enter on to private property to conduct independent sampling and analysis of fill. If the Department determines that fill does not meet fill quality standards of subsections L4a and L4b of this Section, then it may require the permittee to accomplish any or all of the measures listed in part h. of this subsection at his or her own expense. j. Department Authority to Implement Removal and Remediation Measures: The Department or its authorized agents shall have the authority to implement measures listed in subsection L4h of this Section if the permittee fails to accomplish such measures in a timely manner. The permittee shall be responsible for any costs incurred by the Department or its authorized agents in the conduct of such activities. (Amd. Ord. 4740, 7-19-1999) 5. Minimum Compaction: All fills shall be compacted to a minimum of ninety five percent (95%) of maximum density as determined by American Public Works Association (APWA) specifications. Field density shall be determined in accordance with APWA standards. 6. Maximum Slope: The slope of fill surfaces shall be no steeper than is safe for the intended use. Except in conjunction with a modification granted per RMC 4-9-250D1 for one of the circumstances listed in RMC 4-3-050N2a(ii) (Geologic Hazards - Modifications), fill operations associated with a plat, short plat, subdivision or dedication, or other permitted land development activity which would result in the creation of permanent slopes forty percent (40%) or greater which are fifteen feet (15') in height, i.e., protected slopes, shall not be approved. (Amd. Ord. 4835,3-27- 2000) 7. Drainage and Terracing: Drainage and terracing shall be provided and the area above fill slopes and the surfaces of terraces shall be as required by subsection N of this Section. H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 Renton Municipal Code 4-8-120D Definitions of terms used in submittal requirements for Building, Planning, and Public Works permit applications 19. Definitions A Source Statement, Fill Material, Aquifer Protection Area: A source statement providing the following information: a. The source location of imported fill; b. Previous land uses of the source location; c. Whether or not earth materials to be removed from the source location are native, undisturbed soil; d. Whether or not the source location appears on government lists of contaminated sites including those developed pursuant to the State Model Toxics Control Act and the Federal Comprehensive Environmental Response, Compensation, and Liability Act; e. Results of sampling and analysis pursuant to RMC 4-4-060L4g, Fill Material, Sample and Analysis Procedures; and f. Whether or not imported fill meets fill quality standards described in RMC 4-4- 060L4a, Fill Material, Construction, Demolition and Land Clearing Waste Prohibited, and RMC 4-4-060L4b, Fill Material, Cleanliness of Fill Material. (Ord. 4851, 8-7- 2000) H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 FILL SOURCE STATEMENT FOR PROJECTS IN THE AQUIFER PROTECTION AREA (APA) CITY OF RENTON Development Services Division 1055 South Grady Way, Renton WA 98055 Phone: (425) 430-7200 A Fill Source Statement CERTIFIED BY A PROFESSIONAL ENGINEER OR GEOLOGIST licensed in the State of Washington is required in the following circumstances: 1. More than 50 cubic yards of fill will be imported to a project site located in Zone 1 of the Aquifer Protection Area. 2. More than 100 cubic yards of fill will be imported to a project site located in Zone 2 of the Aquifer Protection Area. Exception: A Fill Source Statement is not required if documentation is provided that the fill to be imported comes from a Washington Department of Transportation approved source. It is required that fill material be sampled AT THE FILL SOURCE SITE and analyzed by a laboratory to rule out contamination. See 11 below. A fill source site may qualify for an ABBREVIATED FILL SOURCE STATEMENT if the source site has never been filled, developed, or subjected to use that could have introduced chemical contamination to the site. The abbreviated format does not require sampling and analysis of fill to detect contamination and, therefore, reduces applicant costs. Please use attached form entitled “Abbreviated Fill Source Statement”. A SEPARATE SOURCE STATEMENT IS REQUIRED FOR EACH FILL SOURCE SITE. A copy of the Renton Municipal Code section requiring the Fill Source Statement is attached for your information. (RMC 4-4-060L4). CONTACT THE DEVELOPMENT SERVICES DIVISION TO DETERMINE IF YOUR PROJECT SITE IS LOCATED IN THE APA. NOTE: The Department has the authority to request additional information regarding imported fill material and to reject a source statement if it does not demonstrate that the fill material meets City standards and/or the Department has reason to suspect that the fill material could be contaminated. Such requests or rejections shall be made in writing to the applicant. 1. Project Site Address: 2. Project Site King County Tax Assessor Account Number: 3. In which Aquifer Protection Area Zone is the project site located, 1 or 2? 4. Cubic yards of fill to be imported to project site: 5. Project applicant name: 6. Fill source site address: 7. Fill source site King County Tax Assessor Account Number: Table 1: Results of Source Fill Characterization Sampling and AnalysisUrban Union Construction SiteSample #Diesel Heavy OilVolatile Organic Compounds (ug/kg) cPAHs (ug/kg) Arsenic Chromium Lead57 24.4 U61 U ND ND 2.26 37.5 2.3354 21.2 U 52.9 U‐‐ ‐‐2.33 33.4 2.1351 21.7 U 54.3 UND‐‐2.11 37.9 2.1258 20.6 U 51.6 U‐‐ ‐‐1.62 34.5 1.3255 20.7 U 51.8 UND‐‐1.62 27.1 1.5352 24.1 U 60.3 U‐‐ ‐‐2.39 27.5 2.0553 21.6 U 53.9 U ND ND 1.53 29 1.3956 20.8 U 52.1 U‐‐ND 1.8 24.4 1.8859 20.4 U 51.1 UND‐‐1.92 21.2 1.35Note: Soil samples collected from Urban Union Construction Site on January 14, 2015 U ‐ not detected at concentration limit specified ND ‐ not detectedNWTPH‐Dx (mg/kg) Metals (mg/kg) H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 Renton Municipal Code 4-4-060 Grading, Excavation, and Mining Regulations L. FILLS: 1. Applicability and Exemptions: Unless otherwise recommended in the approved soil engineering report, fills shall conform to the provisions of this Section. In the absence of an approved soil engineering report, these provisions may be waived for minor fills not intended to support structures. For minor fills or waste areas, humps, hollows or water pockets shall be graded smooth with acceptable slopes. 2. Fill Location: Fill slopes shall not be constructed: a. On natural slopes steeper than two-and-one-half horizontal to one vertical (2.5:1) that are fifteen feet (15') or greater in height (except in conjunction with a modification granted per RMC 4-9-250D1 for filling against the toe of a natural rock wall - see RMC 43-060N2a(ii)(2)); or b. Where the fill slopes toes out within twelve feet (12') horizontally of the top of existing or planned cut slopes that are fifteen feet (15') or greater in height and steeper than two-and-one-half horizontal to one vertical (2.5:1). (Amd. Ord. 4835, 3-27-2000; Ord. 4851, 8-7-2000) 3. Preparation of Ground: The ground surface shall be prepared to receive fill by removing vegetation, noncomplying fill, topsoil and other unsuitable materials as determined by the soil engineer, and where the slopes are five to one (5:1) or steeper, by benching into sound bedrock or other competent material. 4. Fill Material: Fill materials shall have no more than minor amounts of organic substances and shall have no rock or similar irreducible material with a maximum dimension greater than eight inches (8"). Fill material shall meet the following requirements: a. Construction, Demolition, and Land Clearing Waste Prohibited: Fill material shall be free of construction, demolition, and land clearing waste except that this requirement does not preclude the use of recycled concrete rubble per Washington State Department of Transportation Standard Specifications for Road, Bridge, and Municipal Construction. b. Cleanliness of Fill Material: Fill material shall not contain concentrations of contaminants that exceed cleanup standards for soil specified in WAC 173-340- 740, Model Toxics Control Act, regardless of whether all or part of the contamination is due to natural background levels at the fill source site. For project sites located in Zone 1 of the Aquifer Protection Area, fill material shall not contain detectable concentrations of petroleum per the definition of Class 1 Soils contained in Table V in "Guidance for Remediation of Petroleum Contaminated Soils" published by the Department of Ecology. Where the detection limit (lower limit at which a chemical can be detected by a specified laboratory procedure) for a particular soil contaminant exceeds the cleanup standard for soil specified in WAC 173-340-740, then the detection limit shall be the standard for fill material quality. Detection limits shall be a published by the Department of Ecology in the current version of "TABLE II: SOIL, Method Detection Limits, Practical Quantitation Limits, and Comparison of Method B Values" or other source of information accepted by the Department if the Ecology publication does not address the contaminant. H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 c. Special Requirement for Projects Located in Zone 1 of the Aquifer Protection Area and Which Will Involve Placement of More than Fifty (50) Cubic Yards of Imported Fill: A source statement certified by a professional engineer licensed in the State of Washington shall be provided to the Department and shall be reviewed and accepted by the Department prior to stockpiling or grading imported fill at the project site. The source statement, as defined in RMC 4-8- 120D19, shall be required for each source location from which imported fill will be obtained. (Amd. Ord. 4851, 8-7-2000) d. Special Requirement for Projects Located in Zone 2 of the Aquifer Protection Area and Which Will Involve Placement of more than One Hundred (100) Cubic Yards of Imported Fill: The source statement described in RMC 4-8-120D19 is required for each source location from which imported fill will be obtained. (Amd. Ord. 4851, 8-7-2000) e. Abbreviated Source Statement for Aquifer Protection Area: The Department may accept a source statement, as defined in RMC 4-8-120D19, that does not include results of sampling and analysis of imported fill if it determines that adequate information is provided indicating that the source location is free of contamination. In addition to the information otherwise required by subsection as defined in RMC 4-8-120D19, such information may include, but is not limited to: i. Results of field testing of earth materials to be imported to the site with instruments capable of detecting the presence of contaminants; and ii. Results of previous sampling and analysis of earth materials to be imported to the site. (Amd. Ord. 4851, 8-7-2000) f. Source Statement Not Required for Imported Fill Obtained from Washington State Department of Transportation Approved Source: The source statement defined in RMC 4-8-120D19 is not required for those projects located in the aquifer protection area if contractual documents confirm that imported fill will be obtained from a Washington State Department of Transportation approved source. (Amd. Ord. 4851, 8-7-2000) g. Sampling and Analysis Procedures: The professional engineer or person under the professional engineer's supervision who samples earth materials to be used as imported fill, oversees analysis, and prepares the source statement required by subsections L4c and L4d of this Section shall follow procedures specified in WAC 173-340-820 and 173-340-830 of the Model Toxics Control Act Cleanup Regulation and "Guidance on Sampling and Data Analysis Methods" published by the Department of Ecology for earth materials potentially contaminated with hazardous materials other than petroleum. Procedures specified in "Guidance for Remediation of Petroleum Contaminated Soils" published by the Department of Ecology shall be followed for earth materials potentially contaminated with petroleum. h. Permittee Subject to Required Actions after Illegal Placement of Imported Fill. A permittee who stockpiles or grades imported fill at the site without Department review and acceptance of the source statement required by subsections L4c and L4d of this Section or who stockpiles or grades fill at the site that does not meet the fill quality requirements of subsections L4a and L4b of this Section is subject to measures specified by the Department to reduce risk of contamination of the site due to illegal placement of fill. Such measures may include, but are not limited to, any or all of the following and shall be implemented at the permittee's expense: H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 1. Provide the Department with a source statement meeting the requirements of subsection L4c of this Section within a time-period specified by the Department; 2. Immediately cover fill with a waterproof cover; 3. Immediately remove fill; 4. Installation of monitoring wells and monitoring of ground water quality; 5. Remediation of contamination of the site caused by the illegal placement of fill according to a schedule specified by the Department and in accordance with cleanup standards for soil and groundwater described in the Model Toxics Control Act Cleanup Regulation, Chapter 173-340. i. Department Authority to Conduct Independent Sampling and Analysis: The Department shall have the authority to enter on to private property to conduct independent sampling and analysis of fill. If the Department determines that fill does not meet fill quality standards of subsections L4a and L4b of this Section, then it may require the permittee to accomplish any or all of the measures listed in part h. of this subsection at his or her own expense. j. Department Authority to Implement Removal and Remediation Measures: The Department or its authorized agents shall have the authority to implement measures listed in subsection L4h of this Section if the permittee fails to accomplish such measures in a timely manner. The permittee shall be responsible for any costs incurred by the Department or its authorized agents in the conduct of such activities. (Amd. Ord. 4740, 7-19-1999) 5. Minimum Compaction: All fills shall be compacted to a minimum of ninety five percent (95%) of maximum density as determined by American Public Works Association (APWA) specifications. Field density shall be determined in accordance with APWA standards. 6. Maximum Slope: The slope of fill surfaces shall be no steeper than is safe for the intended use. Except in conjunction with a modification granted per RMC 4-9-250D1 for one of the circumstances listed in RMC 4-3-050N2a(ii) (Geologic Hazards - Modifications), fill operations associated with a plat, short plat, subdivision or dedication, or other permitted land development activity which would result in the creation of permanent slopes forty percent (40%) or greater which are fifteen feet (15') in height, i.e., protected slopes, shall not be approved. (Amd. Ord. 4835,3-27- 2000) 7. Drainage and Terracing: Drainage and terracing shall be provided and the area above fill slopes and the surfaces of terraces shall be as required by subsection N of this Section. H/PW/CED/Data/Forms-Templates/Self Help Handouts/Pubic Works/Fill Source Statement.doc 09/11 Renton Municipal Code 4-8-120D Definitions of terms used in submittal requirements for Building, Planning, and Public Works permit applications 19. Definitions A Source Statement, Fill Material, Aquifer Protection Area: A source statement providing the following information: a. The source location of imported fill; b. Previous land uses of the source location; c. Whether or not earth materials to be removed from the source location are native, undisturbed soil; d. Whether or not the source location appears on government lists of contaminated sites including those developed pursuant to the State Model Toxics Control Act and the Federal Comprehensive Environmental Response, Compensation, and Liability Act; e. Results of sampling and analysis pursuant to RMC 4-4-060L4g, Fill Material, Sample and Analysis Procedures; and f. Whether or not imported fill meets fill quality standards described in RMC 4-4- 060L4a, Fill Material, Construction, Demolition and Land Clearing Waste Prohibited, and RMC 4-4-060L4b, Fill Material, Cleanliness of Fill Material. (Ord. 4851, 8-7- 2000)